im trying to make a backspace button for an xcode project but its not working
heres the code for it can anyone edit it to make it work
heres the code for it can anyone edit it to make it work
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macOS making backspace button on Xcode
- Thread starter abcdefg12345
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A quick and dirty fix to your code would look something like this:
Reason is that you were thinking you got a NSString in the first line, but you were actually getting a NSTextField.
You would have found this easily if you used the actual class names instead of id for your IBOutlets.
It's always a good idea to avoid id unless you really have a good reason to use it.
Hope this helps you to continue
// Alex
Code:
-(IBAction)Back:(id)sender {
NSString *backspace = [conv_display stringValue];
float lengthofstring = backspace.length;
if (lengthofstring == 0)
return;
backspace = [backspace substringToIndex:lengthofstring - 1];
[conv_display setStringValue:backspace];
}Reason is that you were thinking you got a NSString in the first line, but you were actually getting a NSTextField.
You would have found this easily if you used the actual class names instead of id for your IBOutlets.
It's always a good idea to avoid id unless you really have a good reason to use it.
Hope this helps you to continue
// Alex
A quick and dirty fix to your code would look something like this:
Code:-(IBAction)Back:(id)sender { NSString *backspace = [conv_display stringValue]; float lengthofstring = backspace.length; if (lengthofstring == 0) return; backspace = [backspace substringToIndex:lengthofstring - 1]; [conv_display setStringValue:backspace]; }
Reason is that you were thinking you got a NSString in the first line, but you were actually getting a NSTextField.
You would have found this easily if you used the actual class names instead of id for your IBOutlets.
It's always a good idea to avoid id unless you really have a good reason to use it.
Hope this helps you to continue
// Alex
thanks a lot I tried it and it worked
A quick and dirty fix to your code would look something like this:
Code:-(IBAction)Back:(id)sender { NSString *backspace = [conv_display stringValue]; float lengthofstring = backspace.length; if (lengthofstring == 0) return; backspace = [backspace substringToIndex:lengthofstring - 1]; [conv_display setStringValue:backspace]; }
Reason is that you were thinking you got a NSString in the first line, but you were actually getting a NSTextField.
You would have found this easily if you used the actual class names instead of id for your IBOutlets.
It's always a good idea to avoid id unless you really have a good reason to use it.
Hope this helps you to continue
// Alex
Hey where would you implement this is in the main file or the header file?